According to KMGH-TV, drones are sometimes considered model aircraft, which only have to follow FAA guidelines. Those guidelines say hobby aircraft-flyers must keep their aircrafts below 400 feet above ground level and away from airports and air traffic.

Denver police say they found two unidentified men flying a drone over the rally in Denver’s Civic Center Park. They were asked to leave the top of the McNichols Civic Center Building because they didn’t have the proper permission.